Formula: [°F] = [°C] × 1.8 + 32
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°F to °C: [°C] = ([°F] − 32) × 5⁄9°C to °F: [°F] = [°C] × 1.8 + 32
The formula, for any value is C = 5/9*(F - 32). Let F = -40 and solve for C.
Use this formula to convert degrees Fahrenheit (F) to degrees Celsius (C): [°C] = ([°F] − 32) × 5⁄9
C to F.. Multiply by 1.8 then add 32. F to C.. Subtract 32 then divide by 1.8
F = C × 9/5 + 32 C = (F - 32) x 5/9